CN1015658B - Quick detector of colour - Google Patents
Quick detector of colourInfo
- Publication number
- CN1015658B CN1015658B CN 88103026 CN88103026A CN1015658B CN 1015658 B CN1015658 B CN 1015658B CN 88103026 CN88103026 CN 88103026 CN 88103026 A CN88103026 A CN 88103026A CN 1015658 B CN1015658 B CN 1015658B
- Authority
- CN
- China
- Prior art keywords
- fast
- measuring device
- colour
- spectral
- light path
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- 238000012545 processing Methods 0.000 abstract description 6
- 238000010183 spectrum analysis Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
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- 238000006243 chemical reaction Methods 0.000 description 6
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- Spectrometry And Color Measurement (AREA)
Abstract
The present invention relates to a fast colour measuring device which is an optical device for measuring colours. Since the fast colour measuring device adopts an acoustic-optic tunable light filter (AOTF) which can fast, continuously and electrically tune and is conveniently controlled by a computer in parallel as the light splitting element of a light path in a visible light region, the fast colour measuring device can be controlled by the computer to accomplish fast spectral scan and simultaneously carry out data processing for spectral information. The fast colour measuring device can improve time required by colour measurement; compared with the traditional spectral photometer, the fast colour measuring device can shorten the time for colour measurement by numbers of orders of magnitude. Therefore, the fast colour measuring device inaugurates a new approach for accurate, fast and real-time color measurement. The fast colour measuring device can be widely used for chrominance detection for textile, printing, etc. and for fields of fast chrominance analysis, spectral analysis, etc.
Description
The invention belongs to the optical devices of measuring color.
The existing optical instrument of measuring color generally is divided into two big classes.One class is the photoelectric integration color measurement instrument, and it is to utilize the photoelectric integration device with special spectrum sensitivity, direct measurement light source look or object values or chromaticity coordinate, though its colour examining speed is fast, precision is low.Another kind of for the colour examining spectrophotometer, it is by light-splitting device, object is carried out spectral luminosity measure, and records the spectral reflectance factor or the spectral-transmission favtor of object, through data processing, computing and then draw the values of object color and chromaticity coordinate.Be characterized in colour examining precision height, thus can realize the look measurement of pin-point accuracy with it, or the photoelectric integration color measurement instrument is calibrated, or set up color standard.But its shortcoming is that colour examining speed is slow, generally do a colour measurement and need second-time even above time of branch, its reason is because the monochromator in the colorimeter mostly carries out spectral scan with grating or prism as light-splitting device, during work, need to control moving of grating or prism, and mechanical action has been placed restrictions on the speed of spectral scan, though therefore this colour examining spectrophotometer precision height by a mechanical mechanism, but be difficult to measure in real time, make its application be subjected to placing restrictions on it.
Task of the present invention provides a kind of quick detector of colour, and it had both had the colour examining precision of existing colour examining spectrophotometer, and high colour examining speed is arranged again.
The device that invention provides belongs to colour examining spectrophotometer one class.Its invention essence is to adopt acousto-optic tunable filter (being called for short AOTF) to carry out spectral scan as the light-splitting device in the light path, because acousto-optic tunable filter has tuning and be convenient to characteristics with the computing machine joint control in the quick continuous electric of visible region, so in device, be provided with a corresponding driving control circuit again, AOTF realizes rapid spectrum scanning with computer interconnection control, and the synchronous acquisition spectral signal is finished colourity calculating, make contrive equipment both keep the colour examining precision of original spectrophotometer, improved colour examining speed again.Constitute for ease of understanding invention, describe the present invention in detail below in conjunction with accompanying drawing.
Fig. 1 is the contrive equipment schematic diagram, and wherein the 0/d lighting system is adopted in the light path illumination.
Fig. 2 is the light path of 0/45 lighting system.
Fig. 3 is a kind of control circuit of contrive equipment.
With reference to Fig. 1, full device can be divided into light path and Drive and Control Circuit two parts, and its light path comprises: lighting source 1, collimated light path 2, diaphragm 3,7, the polaroid 4 and 6 that pair of orthogonal is placed, acousto-optic tunable filter (AOTF) 5, sample 8 and integrating sphere 9.Drive and Control Circuit comprises: photomultiplier 10, photomultiplier power supply 11, optical signal amplification circuit 12, A/D transducer 13, microcomputer 15, decoding scheme 16, register 17 and length scanning control circuit 22.Here, what light path adopted is the 0/d lighting system, lighting source 1 is behind collimated light path 2 collimations, incident AOTF5, the a branch of diffraction light that leaches with the AOTF sample 8 that goes to throw light on, diffusing behind integrating sphere 9 integrations on the sample face, be translated into photocurrent by photomultiplier 10 receptions, this photocurrent is after optical signal amplification circuit 12 amplifies, send into and carry out conversion in the A/D transducer 13, analog signal conversion is become digital quantity, read in, obtain the spectral information of sample by computing machine 15, meanwhile, computing machine sends wavelength control and counts Data, and this Data number is used to control AOTF by its generation-radiofrequency signal sample is carried out spectral scan through register 17 input wavelength scan control circuits 22.Here, the length scanning control circuit is by D/A transducer 18, current/voltage translation circuit 19, radio-frequency signal generator 20 and radio-frequency power amplifier 21 are formed, radio-frequency signal generator wherein can adopt common RF Voltage-Controlled Oscillator or frequency synthesizer, and what diagram adopted is RF Voltage-Controlled Oscillator.Its course of work is: the wavelength control that computing machine sends is counted Data through register, be transformed to voltage control signal V input radio frequency voltage controlled oscillator by D/A transducer and current/voltage translation circuit, it produces the radiofrequency signal of a decision AOTF filter wavelength and through amplifying, removes to drive AOTF sample is carried out spectral scan.The centre wavelength of the optical filtering passband of AOTF is by the decision of the frequency of radiofrequency signal, and the wavelength control sent by computing machine of the oscillation frequency that produces of RF Voltage-Controlled Oscillator is counted the voltage V control that Data is obtained after conversion herein.When the wavelength control of sending when computing machine was counted Data and changed, then the frequency of the radiofrequency signal of Chan Shenging also changed thereupon, also does corresponding change so AOTF carries out the wavelength of spectral scan, for example requires 4000～7000
In the wavelength coverage, every 100
Get spectral measurement point, carry out spectral scan, measure colourity, then only need in advance with each operation wavelength 4000 of AOTF
, 4100
6900
, the pairing wavelength control of 7000A is counted Data and is deposited computing machine in, and during spectral scan, computing machine order on request sends wavelength control and counts Data and get final product.Computing machine is sent out the interval time of Data number and can artificially be set, and it is whenever being read in, and behind spectral information of data processing, sends-the Data number.But be preferably in access delay circuit 14 between the decoding scheme 16 of computer interface and the A/D transducer 13, sample conversion after Data sends certain hour so that the A/D transducer can automatically be counted in wavelength control.Around here, computing machine just in time can carry out data processing to the previous spectral information that reads in, colourity is calculated, and when it sends new Data and counts, can receive previous spectral information again from the A/D transducer, this shows, because the effect of delay circuit in the arbitrary moment at measuring samples spectrum, can make the transmission of its each road signal, the analog to digital conversion of A/D transducer, the spectral manipulation of computing machine, colourity calculating forms line production automatically and carries out synchronously, more can increase substantially colour examining speed, and its colour examining time can reach millisecond even microsecond magnitude, more traditional spectrophotometer ratio, the colour examining required time can shorten several magnitude.
Light path illumination in the contrive equipment can be adopted the 0/d lighting system, also can adopt the lighting system of d/0 or 0/45 or 45/0, as shown in Figure 2, is the index path of 0/45 lighting system.Computing machine by the reference with the spectrum parameter of itself and known white standard, can obtain the reflectivity ρ (λ) or the transmissivity (λ) of sample, the values formula in the utilization colorimetry behind the spectral information that has obtained sample:
X＝k∫
780 380P
e（λ）ρ（λ） x（λ）dλ
Y＝k∫
780 380P
e（λ）ρ（λ） y（λ）dλ
Z＝k∫
780 380P
e（λ）ρ（λ） z（λ）dλ
Can calculate the colorimetric parameter of sample, draw the values of object and further calculate chromaticity coordinate.
Pe(λ in the formula) is the relative power distribution of standard illuminants, ρ (λ) is the reflectance factor with the corresponding sample of lighting system, if transmissive body, then use τ (λ) for it, x(λ), y(λ), z(λ) be standard observer's spectrum stimulus value, k is a coefficient.
Fig. 3 shows a kind of example of control circuit in the contrive equipment, and computing machine is by data line D
0～D
7Send out the wavelength control number to register 74LS373, MC1508L8 is transformed to electric current by the D/A transducer, be converted into the voltage V of control RF Voltage-Controlled Oscillator again through operational amplifier LM358, input radio frequency voltage controlled oscillator 20, the radiofrequency signal of its generation in the output of P point, drives AOTF sample is carried out spectral scan after radio-frequency power amplifier 21 amplifies, what this example had been used is common RF Voltage-Controlled Oscillator and power amplifier, and its model is " SGY-1 ".Photomultiplier 10 is formed the photosignal that records via three-stage operational amplifier direct current photoelectric signal amplifier 12 is enlarged into 0～5 volt sampled voltage signal, this signal is converted to digital quantity input computing machine via the A/D transducer ADC0809 of delay circuit 74LS123 control starting, by computing machine the spectral information that reads is carried out data processing, colourity is calculated.Here A/D, D/A transducer can be with 8, also can be with 10, and 12 or 14.
The color measuring device that invention provides, fast continuous electric is tuning and be convenient to and the acousto-optic tunable filter (AOTF) of the computing machine joint control light-splitting device as light path at visible region owing to adopted, so can control rapid spectrum scanning and carry out the spectroscopic data processing by computing machine, thereby significantly reduced the spectral scan required time, improved colour examining speed, opened up new way for measuring color accurately, fast, in real time.This device can be applicable to weaving, fields such as the colorimetric detection of printing and dyeing, printing, lighting source, the quick colorimetric analysis of sample, also can be used as the fast spectral analysis instrument, sample is carried out the real time spectrum analysis, or be used on the production line monitoring to the sample composition, in the chemical reaction process to the real-time detection of product, the aspects such as monitoring in the photodetector production run.
Claims (5)
1, a kind of quick detector of colour contains light path part, it is characterized in that carrying out spectral scan with acousto-optic tunable filter (AOTF) [5] as the light-splitting device in the light path, and it is controlled by Drive and Control Circuit, and this control circuit comprises:
A) photomultiplier [10], photomultiplier power supply [11], optical signal amplification circuit [12] is that photosignal also amplifies with phototransformation.
B) A/D transducer [13] is converted into digital quantity to photosignal and reads in computing machine [15]
C) decoding scheme [16]
D) register [17] is deposited the wavelength control that computing machine sends and is counted Data
E) length scanning control circuit [22] produces a radio frequency signals drive acousto-optic tunable filter [5] and carries out spectral scan.
2, by the described color measuring device of claim 1, it is characterized in that said length scanning control circuit (22) by D/A transducer (18), current/voltage translation circuit (19), radio-frequency signal generator (20) and radio-frequency power amplifier (21) are formed.
3, by the described color measuring device of claim 2, it is characterized in that said radio-frequency signal generator is RF Voltage-Controlled Oscillator or frequency synthesizer.
4,, it is characterized in that between the decoding scheme (16) of A/D transducer (13) and computer interface, inserting a delay circuit (14) by the described color measuring device of claim 1.
5,, it is characterized in that light path illumination employing 0/d lighting system or d/0 or 0/45 or 45/0 lighting system by the described color measuring device of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88103026 CN1015658B (en) | 1988-05-20 | 1988-05-20 | Quick detector of colour |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88103026 CN1015658B (en) | 1988-05-20 | 1988-05-20 | Quick detector of colour |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1037773A CN1037773A (en) | 1989-12-06 |
| CN1015658B true CN1015658B (en) | 1992-02-26 |
Family
ID=4832407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88103026 Expired CN1015658B (en) | 1988-05-20 | 1988-05-20 | Quick detector of colour |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1015658B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1308740C (en) * | 2002-11-22 | 2007-04-04 | 天津市先石光学技术有限公司 | Method and apparatus for improving signal-to-noise ratio of acousto-optic tunable filter light splitting system |
| CN100458423C (en) * | 2003-03-21 | 2009-02-04 | 中国印钞造币总公司 | Detecting method for color printing quality |
| CN102353447B (en) * | 2011-07-22 | 2014-11-19 | 苏州大学 | Spectrum scaling apparatus used for spectrum imager |
-
1988
- 1988-05-20 CN CN 88103026 patent/CN1015658B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1037773A (en) | 1989-12-06 |
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